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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43be8f0dc8df8031d9f8fd51eb8d4aeca32588d68f356616982f7180863b130d' 
  AND token = 'meI34/RQfPokASNYstDfE2ZWnZs6ZlqvVhxt6UjH8Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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