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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7cef5b6b114afa2ff60ca944cb6c6694a5b711a5938ca6dbbf7338c63b3c9a' 
  AND token = 'mDYbyeqIMeyq/Nl2ggLfIve2bNcUcKng/SycGpCJNTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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