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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276d9257e79ccddd443aa112435c635daf0b629ed1f9acc8ec99cd24a0636bc2' 
  AND token = 'en68/XcTTENK5Fp24X2Zfh0+WQOAZY8HrEitJFXKNnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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