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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb1283f48bb83ebff75dd95d14bb7d745e35acb285c8f8871a37ad4e013d0d2' 
  AND token = 'qmymWMLmMX5U5z+LF54ic1p8i3gCrzVmRyM/JQ7LHGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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