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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941aac8b102040a4f312d3f6987b966a6c66a9dcf4425388ae81f25a622e6ba6' 
  AND token = 'G8ohKYkCzxLxzKbIuBGLqX+b5i2ki362hKf7u05Qigs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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