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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d595812502c467442132da4d0ac038e8b1a2457f76e21ea3aa73a2c258c5427' 
  AND token = 'N+VmNFaYoVInulSPjAw7QJTXnQHlVj7c4Npn7I2kTco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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