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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0367093df2add35f1a384060a00e7faebbc715093e99ad9faa57fa38f08d24d0' 
  AND token = '80a4TBoWvhJEmWxQDW+zDNz/vtl9EplYqnmeJ9x/TuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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