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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34d427ea94d709899220adf7d492c2ce51b07d8e17038ae5339e678ed547351' 
  AND token = 'dwNzkChrS1ifjf4KXHxBp9po21BJIdfRJe5Q4bAOUik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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