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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f99000a5989bd798e22237dd9923b9bd634673068bfac6b9ad1e03f406466c2' 
  AND token = 'NxPSf9crAQsBhGr5xuk2tKh0X2xAYzCNHKjGQ25aW6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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