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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ef0e730cf38a3de4c38130c0a81bb17474004cfb215dc9491a85de09af0f13' 
  AND token = 'GMdfFj2AOjiwAb80E8ELJAQcn1JjGgY4kg3F6stCo10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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