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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86d4cbb34cea94dd450aec95783980365c8dcf5aa73ad72120879c62b6c6d46' 
  AND token = 'hyALV/yKoG6K9Feh0G8Lss/atDTlgViaFlraZqmg+ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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