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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed0a45d96e778f1f4940318059b694f1b0d0b0a1ddb6ded938119c17ed8e71e' 
  AND token = 'DjJ2wnYWtu1X6d8RttsTeAVXUw1kP54KNeJzLHLXoJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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