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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62112a069a56f98b5f0ba87cc901c46d4ca2b9d2f743002c98aa288a68bf6e0' 
  AND token = 'L6diJrQQIya7M7xi44X6TBxeV9pLozizoHPsr3ZRoH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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