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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9584ba227a8b69cab68d6539a20ee29459cd35b0a579a6b87149c6ea9fcf14' 
  AND token = 'Iqdr+Dn8p7da0u+3FWQqe09DYGbTqf/TwF6sycU+dRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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