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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd5f8bb1d163a43cbbc98d5afbc74abb5ea1f2fe94065f27328246e623db074' 
  AND token = 'IDlZr9CzvL6tozxxTYRS3M+m5HeG6ZvryVOZRePGaxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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