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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b8bac310d5e3233dec1ed36ac552838cbd79ce2e38eb17ccf6a415efb3350e' 
  AND token = 'v5Abty16ur4I0Sh4mDsmmwuQDcle66z9S024bAiseKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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