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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4eacd0d8503c9aa63266df9492a7e491b365f5da5cb39219e3e9f07520126c3' 
  AND token = 'ThMlVVCG2/RfCiF1CU+abJefjfMnseDRL/1t/zVGJFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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