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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cb6de40a0281a1ef54cc4f55ef591d46cfcc6cd737297ae6a2378d6fddf0da' 
  AND token = 'moTTe+NQp5W0TfHoYKDVooMH4FK9/uVXBcj978pk/FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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