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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c0ad1635bfb1cfa43e96918ecca9c5b4f09fa51cbb7e8c8ec8424e71088aa0' 
  AND token = 'jsQNgGf6rwXRrKEQ6eONKmKYVdCNsbvqk7OVdG6so6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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