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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5084b1c1efe14d05340b00a57a42d2ba101e5ce2ec7bf6d6ebb596cfdc44aeb' 
  AND token = 'PGggLuuR1HUmKUb0K5Fu1xMJb1YBQWk8oaXItwanlEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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