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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27865f153b3dd84e0b6252ce189653bf306ec5515e9b585a4ae720214c82b82c' 
  AND token = '9AOifGPoF1qo/JWFAABx8nt19VqOvNEonjpzexZkUtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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