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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926d345e9d02fd24f4e638ac0823d933a65fda7dded5b990852b9bdfffe9a97e' 
  AND token = 'P89uboZVxZ+rFTbmTwPtg5p5clLw1aYoVnByNHO84g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}