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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772f2dcce51dbd4af40590d08c1d5293b3f6e19b3702ed8f4aa7fdfcfaca6b75' 
  AND token = 'f2403DqQjpQMmlC2myBUYNF9QetenkB4R0RZaIsbAnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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