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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac88a56b61077244431f067273b557a9093029a2167bb3f3c77968aca3462679' 
  AND token = 'Rw4AcYuyk+SAP2fbDU0rRw06D0ix5nd4FkxseoMavVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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