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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86b30dde19f075c68c74e514604d37c495649273423ffe04eea0e8b23aad91d' 
  AND token = 'cJ3MKVVfnnrz8fa9S1W3Is4PFt5JLk9wqD+oi0bWju4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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