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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd804db1104f2cce209534c704cd5b208bfc7e8d43619bc8da134f2c03d78c77' 
  AND token = 'XFCw8m5gFrgrYzshaMMT2Z2Z71KwRQ0c0hppFLbqgUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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