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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0b785e502be6ab1211463f274b2a3d6e92eb2e7c206d91d07b758f0c6599a6' 
  AND token = 'h0plGzMRAAoU/eOJD+jHKZ1JcJyPXkPz5l58P5fkNGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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