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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c94771b236e11202663695cffc62f5de08b0e02e0cf0cbc044a44ef49b68577' 
  AND token = '0YfH4MWbxjFO0BsZu4FGEtO2FgGASiMk7dw2eIMpvp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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