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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76afdcac2702873ed36e7d6d62a21b0bc767856987adc0f7e25da155222159b' 
  AND token = 'd3D4iokReCVSN8s7XH+y11k7AetyHmM9GxEzU/v6uk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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