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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40fcd39af40bddce5adde6278f73c5ad245510b3a9aeaf84bb1a1794b629be4' 
  AND token = 'fngd8RPGXv0OqdwGX9AaK1VjAiBmwL/aadM/IaHiILQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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