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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d91e3254e5f733589e3a42464cd2346007e31c32823051f840bf94f78917ee' 
  AND token = 'oDgSJ3TMKo7z5bslhQxyGa2pUGXaf+m+1YIjKIcmczI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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