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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9a0e498cea2292b0e4d5e9767b8aad818971f3fb88771ad31a7a03909183b2' 
  AND token = 'WysmmCQSR3gesjH0eDQIfbM3OQCpASqNUNCrAK44cXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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