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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1d54d10c9e6b6fceaa4584dde83ec855f3707d9ae0af27d9aebc0b419db16c' 
  AND token = 'BzRNozCsOwyKzaZGP0m/sCH1uBnALwb0q84ed8St0S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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