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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70a8adabcc00e72577fbed0449e6ae94498de617e659a77ebf81235ee765c9e' 
  AND token = 'p9B5p8eWBjZ7gog6fS/dZczCxECyUoe52ZV7JSp1OhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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