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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7969a5307be9890956b72795e657d4badca368fcbed54ff68359fcbcb2ba8b9' 
  AND token = 'Iv5pW54AsnLUkja8Aw5dN80++dw3OhUh7G36zuf4e/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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