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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650790d1eac478306e226c3a53bae0dae1ff47e54eba1cff1a4f69472f4d6461' 
  AND token = 'mE0jGdQJkuSBr/7o6LXCkk8DUA3uCtktXtxkETT4gfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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