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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51705112951849468001f3899462217279ab763f9798e3d1bea2c844ab452bb9' 
  AND token = 'OWXtnhNGAfHtJ/AHWGy0lfSAtDbGK67n9u5I3ZuK6BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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