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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cfe316b10a7422aed3c9e50ce53b70b9d38628e64194b1b7191d13bba9b7e5' 
  AND token = 'DtxjM8PW9x+CYyi8CGAS9ItkqoR1cWKzEu2c9j7Iugg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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