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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91aab5581e83f64a8c084ecd959ac4633e21ec2291b9b87191735d16ac0302c1' 
  AND token = 'Ws6wxSdmWSNDuaEVIUogJ8eV3HT0TyoEghQrHnFv54I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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