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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a456a9ae2e75b40377a203fc16766da3edca76f5006ac46e8bad8c9fe668bc1' 
  AND token = 'oMnjrK6j1Fd7heCmvH1xlvQsc1H3F1crMi0Dj2RWU4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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