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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2c12118a3bcd519dcc0aa0b9bfc63d5f6923f8f54c3fb3e5e3ffd0375ddcbb' 
  AND token = '7HdRXzaW7hSpbiJb31FIsyRZZJs8MDJSm3FEgClK+vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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