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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03fb811f70d1b99f20f935c8d0612aa3c0e39b01023c513b3640cea63b125e5' 
  AND token = 'zXyNoAOKqwQ4g4DEe2fnp/FAdSrZVRIAK6Kc7RHTw/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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