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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebba308d6d4b3e9bcc4a64ba49bca0d17ade71239dcf2c8bbe85993e8638b74' 
  AND token = 'IT0lIjzQbcGL9Vm3fTjavmt6/RujXN1nHJtccpoFSPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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