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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9b16595c3d2fdcabdbe490d87d68947794d067faa765d4b508bacfcaa17f76' 
  AND token = '2CvbESiGZvXtW8ro1H/KGJSBjEgxZl9SNeOdOyhgXZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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