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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41de93a4b6e4a20111a246199c3ac42ea27e4b018edcc214e9803b30d2e7480' 
  AND token = 'f871vS1nAqPPASSvPtBtAkp+gb7tEzKMKDE6W3KUeTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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