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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe2407f99363dee84b00c5a8499411a6b72325902f865871917e9c61d8eb90b' 
  AND token = 'Y8HNU1lUSYO8xyDNse1LRfGYQwyXKsnPcl3NZ5pKxn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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