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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9402b0dae8d100037bb28b6f843fa62ea7fafb1a1e2b0015149621ab81f7cc' 
  AND token = 'G8D8pWR9O0XLBI+L/lAm4yUdpKEefyaXxs4Xn2I2ClI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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