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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bde6e584e93ce0f4095201e3157c74f8653b72723671673a3d173efda8c576' 
  AND token = 'ponVqQ2P9InUfCwnExSeyRIT88LeoJqiN3mR38fUV6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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