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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb2c544ccaaf3354c82fcb4a1cd9df0be4ac2d17cde217ac66b6fa0423f7a14' 
  AND token = 'Ev77ZI15fRLeNAtkcorGX6HicLLoYWtL6S7IzQ5jVOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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