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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2343e968fa9c567993b7ee4be25abb051b64e449572289c8c9abb6d32fe616c0' 
  AND token = 'yOr3t68aO7w72YZWKyYUvnSs8oJzuuegiIDBQAbtk8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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