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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d8e5dadfe82b13ef947028de3e087a1a4face712140c57427dbb2009371703' 
  AND token = '+odPCLt2T0QMNCaY4AZeTGLQlqjnrs9VjH6xo+ECqoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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