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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f80224258cec2963531c3169a64132a0a0ab9fc9cc59e83912208c0169fc94' 
  AND token = '7olqRL1JEr7G57oN3K9mAMRq9MshqpfmlJht5BBEJFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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