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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2548fa96cc2999cf3b3f44e7e32d09d4df48377a0e02a0a26193334eaa974ebb' 
  AND token = '3DGPVac6/REHagJ5BkzgN3107TIx/YJ4DrFp4SLGulc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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