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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da53e7f2d60af2e02882e99ba9c865e8cf9c17423405ec3987bcf01a989bc858' 
  AND token = 'QGtFUOrXECHQyFiQpnxb2H3x4wp8kDJNV1SLByq29zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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