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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40db42054721342c90298ba80a4f264db542a02e07d34e550486761b49695daf' 
  AND token = 'mCI/VGyioeGQMRkJLEWteyZ+uDBTBVDQqAkeu5NolPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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